Cho hình thang ABCD có đáy lớn là AD đáy nhỏ BC nội tiếp đường tròn tâm O, AB và CD kéo dài cắt nhau tại I. Các tiếp tuyến của đường tròn tâm O tại B và D cắt nhau tại K, chứng minh OBID,OBKD nội tiếp

Bài 1 và bài 2 thôi nha, mik sẽ vote và cho ctrlhn ><

Viết lại câu với từ gợi ý 1. Why don't we wait for the bus? -> He suggested........... 2. "You cheated in the exam last week" the teacher said to the student. -> The teacher accused........... 3. " Don't eat too much " the mother said to her son . -> The mother prevented.......... 4. "Sorry! I can't go out with you". -> He apologised................. 5. I / look / forward / hear / you / soon. -> 6. He / congratulate / me / pass / final exam. -> 7. She / time / a lot of / spend / doing / her/homework. -> 8. David / coming / not / for / on /apologised/saturday. ->

Giúp tôi với tôi không hiểu được

tóm tắt truyện "Buổi học cuối cùng"

Có 4 bình mất nhãn đựng các dung dịch không màu sau: dd HCl, dd HNO3, dd KCl và dd KNO3. Để phân biệt các dung dịch trên, ta sử dụng lần lượt A. dd AgNO3, dd BaCl2. B. quỳ tím, dd AgNO3. C. phenolphtalein, dd AgNO3. D. quỳ tím, dd BaCl2.

Giúp mk với ạ mk hứa vote 5 sao

Bài 4: Ở cà chua TT quả đỏ là trộn so với TT quả vàng . 1. Xác định kết quả ở con lai F1 khi cho cà chua quả đỏ giao phấn với cà chua quả vàng . 2. Cho cà chua đỏ F1 trong phép lai trên tự thụ phấn thì tỉ lệ kiểu gen và kiểu hình ở F2 sẽ như thế nào. 3. Trong số cà chua quả đỏ ở F2 làm thế nào để xác định được cây cà chua quả đỏ thuần chủng. Có cần kiểm tra tính thuần chủng của cây quả vàng không? vì sao?.

Đốt cháy hoàn toàn 0,05 mol ankan A rồi dẫn sp cháy qua bình chứa nước vôi trong dư thu được 20 gam kết tủa sau thí nghiệm khối lượng bình chứa nước vôi là

I. Give the correct tense of the verb in brackets : 1.Look ! A man ( run) ….. after the bus. He (want) …….………. to catch it. 2.The baby (cry) ……........……………….because he is hungry now. 3.Tom is ill now. He (become) …..…………… ill 3 days ago. 4.It ( rain) ………..............……..…now. It ( rain) ………......……………..for four hours. 5.I (stay) ……….....……….. until you (come) …………………… tomorrow. 6.This is the best wine I (drink) ……………………. 7.He is reading “WAR AND PEACE ”. How long ……........… she ……....………. (read) ? 8.Shakespeare (write) ......……....…………. a lot of plays. 9.I’m busy at the moment. I (decorate) ….......................………………….. the sitting room. 10.I (buy) ………...…… a new house last year, but I (not sell) ……....………….. my old house yet, so at the moment I ( have) …………....…… two houses. II.Complete the sentences using the correct form of the adjerctives or adverbs in brackets : 1.Mary is (pretty) ........................................................ as her sister. 2.A new house is (expensive) ............................................... than an old house. 3.His job is (important) .................................................... than mine. 4.Of the four ties, I like the red (well) ....................... 5.Nobody is (happy) ............................................ than Miss Snow. 6.Today English is the (international) ............................................................. of language. 7.John is much (strong) ................................................ than I thought. 8.Benches are (comfortable) ......................................... than arm-chairs. 9.Bill is (good) ................................ than you thought. 10.Mr Bush is the (delightful) ............................................. person I have ever known. 11.Dick is the (careful) ............................................... of the three workers. 12.Sam’s conduct is (bad) ................................. than Paul’s 13.Thanks to the progress of science, human life is (good) .................... and (good) .................... 14.The teacher speaks English (fluently) .................................................... than we do. 15. The competition makes the price of goods (cheap) ....................... and (cheap) ....................... 16.Is this book (interesting) ..................................................... than the one you read last week ? 17.My cat is the (pretty) ...................................... of the two. 18.This vegetable soup tastes very (well) ........................... 19.Pil is the (happy) ................................ person we know. 20.These shoes are the (little expensive) .............................................. of all. III. Fill in each blank with the correct form of the word given in capital. 1. My brother is a at Vietnam National University, Ha Noi. STUDY 2. That paints beautiful pictures. ART 3. Ask the if you can borrow this book. LIBRARY 4. That ...plays a lot of different instruments. MUSIC 5. Lan’s brother is a He plays it very well. PIANO 6. If the machine goes wrong, tell the ENGINE 7. We have a who comes twice a week. GARDEN 8. Phone the if the lights don’t work. ELECTRIC 9. Miss Quyen is a She travels a lot. JOURNAL 10. You pay the ... She’s that lady over there. CASH IV. Rewrite sentences but not change the meaning of the sentences. 1. Listening to music at home is more interesting than going to the concert -> I prefer 2. We didn’t enjoy the trip because of the heavy rain -> The heavy rain prevented 3. You shouldn’t eat too much candy. -> You’d 4. He is a slower and more careful driver than I am -> He drives 5. The visitor spoke so quickly that I couldn’t understand what he said. -> The visitor spoke too ……………………………………………………. 6. How heavy was your son last summer? -» What……………………………………………………………………… 7. Be sure to come back home before 9.30! Remember…………………………………………………………….. 8.Listening to music at home is more interesting than going to the concert. I prefer…………………………………………………………………. 9.This girl is the most hardworking in our class. No one…………………………………………………………………… 10.You should not eat too much meat. You'd……………………………………………………………………….